How to Select Unique Values of Data Frame Column in R (Example Code)

In this R tutorial you’ll learn how to select only unique values from a vector or data frame column.

Creating Example Data

data(iris)                  # Loading example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example: Applying unique() Function to Extract Unique Values of Column

unique(iris$Species)        # Select unique values
# [1] setosa     versicolor virginica 
# Levels: setosa versicolor virginica

Related Articles & Further Resources

You may find some related R programming language tutorials on topics such as character strings, numeric values, vectors, and extracting data below:

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